[HDFS-5401] Fix NPE in Directory Scanner for HDFS-2832

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Heterogeneous Storage (HDFS-2832)
• Fix Version/s: Heterogeneous Storage (HDFS-2832)
• Component/s: datanode
• Hadoop Flags: Reviewed
• Assignee: Arpit Agarwal
• Reporter: Arpit Agarwal
• Created: 22/Oct/13 20:40
• Updated: 11/Nov/13 06:54
• Resolved: 23/Oct/13 20:29

Description

Directory scanner is broken by previous changes, NPE exposed by TestDirectoryScanner

testDirectoryScanner(org.apache.hadoop.hdfs.server.datanode.TestDirectoryScanner)  Time elapsed: 27.417 sec  <<< ERROR!
java.lang.NullPointerException: null
        at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.checkAndUpdate(FsDatasetImpl.java:1419)
        at org.apache.hadoop.hdfs.server.datanode.DirectoryScanner.reconcile(DirectoryScanner.java:405)
        at org.apache.hadoop.hdfs.server.datanode.TestDirectoryScanner.scan(TestDirectoryScanner.java:212)
        at org.apache.hadoop.hdfs.server.datanode.TestDirectoryScanner.runTest(TestDirectoryScanner.java:270)
        at org.ap